FR1549904A - - Google Patents

Info

Publication number
FR1549904A
FR1549904A FR1549904DA FR1549904A FR 1549904 A FR1549904 A FR 1549904A FR 1549904D A FR1549904D A FR 1549904DA FR 1549904 A FR1549904 A FR 1549904A
Authority
FR
France
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PL118299A external-priority patent/PL56867B1/pl
Application filed filed Critical
Application granted granted Critical
Publication of FR1549904A publication Critical patent/FR1549904A/fr
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C27/00—Machines which completely free the mineral from the seam
    • E21C27/01—Machines which completely free the mineral from the seam specially adapted for removing overhanging coal
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D23/00—Mine roof supports for step- by- step movement, e.g. in combination with provisions for shifting of conveyors, mining machines, or guides therefor
    • E21D23/04—Structural features of the supporting construction, e.g. linking members between adjacent frames or sets of props; Means for counteracting lateral sliding on inclined floor
    • E21D23/06—Special mine caps or special tops of pit-props for permitting step-by-step movement
    • E21D23/063—Retractable cantilever extensions therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
FR1549904D 1967-01-02 1968-01-02 Expired FR1549904A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL118299A PL56867B1 (fr) 1967-01-02

Publications (1)

Publication Number Publication Date
FR1549904A true FR1549904A (fr) 1968-12-13

Family

ID=19949590

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1549904D Expired FR1549904A (fr) 1967-01-02 1968-01-02

Country Status (2)

Country Link
BE (1) BE708882A (fr)
FR (1) FR1549904A (fr)

Also Published As

Publication number Publication date
BE708882A (fr) 1968-05-16

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Legal Events

Date Code Title Description
ST Notification of lapse